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A student performed the Fractional Crystallization experiment described with the following results: Initial mass of sample mixture: 4.958 g, mass of salicylic acid recovered, 0.586 g; mass of CuSO4•5H2O recovered, 3.12 g. The recovered CuSO4•5H2O was then heated for 15 minutes at 130 °C. The mass of the new hydrate was 2.17 g. Calculate the value of X in the formula for the new hydrate CuSO4•XH2O.

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